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<div class="header">
  <div class="headertitle"><div class="title">riscv_platform_timer.h</div></div>
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<a href="riscv__platform__timer_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno">    1</span><span class="preprocessor">#ifndef _HARDWARE_RISCV_PLATFORM_TIMER_</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno">    2</span><span class="preprocessor">#define _HARDWARE_RISCV_PLATFORM_TIMER_</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno">    3</span> </div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno">    4</span><span class="preprocessor">#ifdef __cplusplus</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno">    5</span><span class="keyword">extern</span> <span class="stringliteral">&quot;C&quot;</span> {</div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno">    6</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno">    7</span> </div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno">    8</span><span class="preprocessor">#include &quot;<a class="code" href="pico_8h.html">pico.h</a>&quot;</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno">    9</span><span class="preprocessor">#include &quot;hardware/structs/sio.h&quot;</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno">   10</span> </div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"><a class="line" href="group__hardware__riscv__platform__timer.html#ga2afc7ae3feafc019abd3883a3f2fe04f">   33</a></span><span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code hl_function" href="group__hardware__riscv__platform__timer.html#ga2afc7ae3feafc019abd3883a3f2fe04f">riscv_timer_set_enabled</a>(<span class="keywordtype">bool</span> enabled) {</div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno">   34</span>    <span class="keywordflow">if</span> (enabled) {</div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno">   35</span>        <span class="comment">// Note atomic rwtype is not supported on SIO</span></div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno">   36</span>        sio_hw-&gt;mtime_ctrl |=  SIO_MTIME_CTRL_EN_BITS;</div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno">   37</span>    } <span class="keywordflow">else</span> {</div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno">   38</span>        sio_hw-&gt;mtime_ctrl &amp;= ~SIO_MTIME_CTRL_EN_BITS;</div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno">   39</span>    }</div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno">   40</span>}</div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno">   41</span> </div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"><a class="line" href="group__hardware__riscv__platform__timer.html#gacdd646c3b36c51473a16c07a799f9eec">   49</a></span><span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code hl_function" href="group__hardware__riscv__platform__timer.html#gacdd646c3b36c51473a16c07a799f9eec">riscv_timer_set_fullspeed</a>(<span class="keywordtype">bool</span> fullspeed) {</div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno">   50</span>    <span class="keywordflow">if</span> (fullspeed) {</div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno">   51</span>        sio_hw-&gt;mtime_ctrl |=  SIO_MTIME_CTRL_FULLSPEED_BITS;</div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno">   52</span>    } <span class="keywordflow">else</span> {</div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno">   53</span>        sio_hw-&gt;mtime_ctrl &amp;= ~SIO_MTIME_CTRL_FULLSPEED_BITS;</div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno">   54</span>    }</div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno">   55</span>}</div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno">   56</span> </div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"><a class="line" href="group__hardware__riscv__platform__timer.html#gab016600bb8fc7553da83a90501371693">   62</a></span><span class="keyword">static</span> <span class="keyword">inline</span> uint64_t <a class="code hl_function" href="group__hardware__riscv__platform__timer.html#gab016600bb8fc7553da83a90501371693">riscv_timer_get_mtime</a>(<span class="keywordtype">void</span>) {</div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno">   63</span>    <span class="comment">// Read procedure from RISC-V ISA manual to avoid being off by 2**32 on</span></div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno">   64</span>    <span class="comment">// low half rollover -- note this loop generally executes only once, and</span></div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno">   65</span>    <span class="comment">// should never execute more than twice:</span></div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno">   66</span>    uint32_t h0, l, h1;</div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno">   67</span>    <span class="keywordflow">do</span> {</div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno">   68</span>        h0 = sio_hw-&gt;mtimeh;</div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno">   69</span>        l  = sio_hw-&gt;mtime;</div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno">   70</span>        h1 = sio_hw-&gt;mtimeh;</div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno">   71</span>    } <span class="keywordflow">while</span> (h0 != h1);</div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno">   72</span>    <span class="keywordflow">return</span> l | (uint64_t)h1 &lt;&lt; 32;</div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno">   73</span>}</div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno">   74</span> </div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"><a class="line" href="group__hardware__riscv__platform__timer.html#ga96285c497dceb9126e6ea3130be72bcb">   85</a></span><span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code hl_function" href="group__hardware__riscv__platform__timer.html#ga96285c497dceb9126e6ea3130be72bcb">riscv_timer_set_mtime</a>(uint64_t mtime) {</div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno">   86</span>    <span class="comment">// This ought really only be done when the timer is stopped, but we can</span></div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno">   87</span>    <span class="comment">// make things a bit safer by clearing the low half of the counter, then</span></div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno">   88</span>    <span class="comment">// writing high half, then low half. This protects against the low half</span></div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno">   89</span>    <span class="comment">// rolling over, and largely avoids getting an intermediate value that is</span></div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno">   90</span>    <span class="comment">// higher than either the original or new value, if the timer is running.</span></div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno">   91</span>    <span class="comment">//</span></div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno">   92</span>    <span class="comment">// Note that on RP2350, mtime is shared between the two cores!(mtimcemp is</span></div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno">   93</span>    <span class="comment">// core-local however.)</span></div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno">   94</span>    sio_hw-&gt;mtime  = 0;</div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno">   95</span>    sio_hw-&gt;mtimeh = mtime &gt;&gt; 32;</div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno">   96</span>    sio_hw-&gt;mtime  = mtime &amp; 0xffffffffu;</div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno">   97</span>}</div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno">   98</span> </div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno"><a class="line" href="group__hardware__riscv__platform__timer.html#ga148695c3ff3dce3222934040cfc77d91">  108</a></span><span class="keyword">static</span> <span class="keyword">inline</span> uint64_t <a class="code hl_function" href="group__hardware__riscv__platform__timer.html#ga148695c3ff3dce3222934040cfc77d91">riscv_timer_get_mtimecmp</a>(<span class="keywordtype">void</span>) {</div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno">  109</span>    <span class="comment">// Use the same procedure as reading mtime, which should be safe assuming</span></div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno">  110</span>    <span class="comment">// mtimecmp increases monotonically with successive interrupts.</span></div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno">  111</span>    uint32_t h0, l, h1;</div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno">  112</span>    <span class="keywordflow">do</span> {</div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno">  113</span>        h0 = sio_hw-&gt;mtimecmph;</div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno">  114</span>        l  = sio_hw-&gt;mtimecmp;</div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno">  115</span>        h1 = sio_hw-&gt;mtimecmph;</div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno">  116</span>    } <span class="keywordflow">while</span> (h0 != h1);</div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno">  117</span>    <span class="keywordflow">return</span> l | (uint64_t)h1 &lt;&lt; 32;</div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno">  118</span>}</div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno">  119</span> </div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno"><a class="line" href="group__hardware__riscv__platform__timer.html#ga7003005e0d2142e95ce53f2ceee29fdd">  130</a></span><span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code hl_function" href="group__hardware__riscv__platform__timer.html#ga7003005e0d2142e95ce53f2ceee29fdd">riscv_timer_set_mtimecmp</a>(uint64_t mtimecmp) {</div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno">  131</span>    <span class="comment">// Use write procedure from RISC-V ISA manual to avoid causing a spurious</span></div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno">  132</span>    <span class="comment">// interrupt when updating the two halves of mtimecmp.</span></div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno">  133</span>    <span class="comment">// No lower than original:</span></div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno">  134</span>    sio_hw-&gt;mtimecmp  = -1u;</div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno">  135</span>    <span class="comment">// No lower than original, no lower than new (assuming new &gt;= original):</span></div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno">  136</span>    sio_hw-&gt;mtimecmph = mtimecmp &gt;&gt; 32;</div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno">  137</span>    <span class="comment">// Equal to new:</span></div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno">  138</span>    sio_hw-&gt;mtimecmp  = mtimecmp &amp; 0xffffffffu;</div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno">  139</span>}</div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno">  140</span> </div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno">  141</span><span class="preprocessor">#ifdef __cplusplus</span></div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno">  142</span>}</div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno">  143</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno">  144</span> </div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno">  145</span><span class="preprocessor">#endif</span></div>
<div class="ttc" id="agroup__hardware__riscv__platform__timer_html_ga148695c3ff3dce3222934040cfc77d91"><div class="ttname"><a href="group__hardware__riscv__platform__timer.html#ga148695c3ff3dce3222934040cfc77d91">riscv_timer_get_mtimecmp</a></div><div class="ttdeci">static uint64_t riscv_timer_get_mtimecmp(void)</div><div class="ttdoc">Get the current RISC-V platform timer mtimecmp value for this core.</div><div class="ttdef"><b>Definition:</b> riscv_platform_timer.h:108</div></div>
<div class="ttc" id="agroup__hardware__riscv__platform__timer_html_ga2afc7ae3feafc019abd3883a3f2fe04f"><div class="ttname"><a href="group__hardware__riscv__platform__timer.html#ga2afc7ae3feafc019abd3883a3f2fe04f">riscv_timer_set_enabled</a></div><div class="ttdeci">static void riscv_timer_set_enabled(bool enabled)</div><div class="ttdoc">Enable or disable the RISC-V platform timer.</div><div class="ttdef"><b>Definition:</b> riscv_platform_timer.h:33</div></div>
<div class="ttc" id="agroup__hardware__riscv__platform__timer_html_ga7003005e0d2142e95ce53f2ceee29fdd"><div class="ttname"><a href="group__hardware__riscv__platform__timer.html#ga7003005e0d2142e95ce53f2ceee29fdd">riscv_timer_set_mtimecmp</a></div><div class="ttdeci">static void riscv_timer_set_mtimecmp(uint64_t mtimecmp)</div><div class="ttdoc">Set a new RISC-V platform timer interrupt comparison value (mtimecmp) for this core.</div><div class="ttdef"><b>Definition:</b> riscv_platform_timer.h:130</div></div>
<div class="ttc" id="agroup__hardware__riscv__platform__timer_html_ga96285c497dceb9126e6ea3130be72bcb"><div class="ttname"><a href="group__hardware__riscv__platform__timer.html#ga96285c497dceb9126e6ea3130be72bcb">riscv_timer_set_mtime</a></div><div class="ttdeci">static void riscv_timer_set_mtime(uint64_t mtime)</div><div class="ttdoc">Update the RISC-V platform timer.</div><div class="ttdef"><b>Definition:</b> riscv_platform_timer.h:85</div></div>
<div class="ttc" id="agroup__hardware__riscv__platform__timer_html_gab016600bb8fc7553da83a90501371693"><div class="ttname"><a href="group__hardware__riscv__platform__timer.html#gab016600bb8fc7553da83a90501371693">riscv_timer_get_mtime</a></div><div class="ttdeci">static uint64_t riscv_timer_get_mtime(void)</div><div class="ttdoc">Read the RISC-V platform timer.</div><div class="ttdef"><b>Definition:</b> riscv_platform_timer.h:62</div></div>
<div class="ttc" id="agroup__hardware__riscv__platform__timer_html_gacdd646c3b36c51473a16c07a799f9eec"><div class="ttname"><a href="group__hardware__riscv__platform__timer.html#gacdd646c3b36c51473a16c07a799f9eec">riscv_timer_set_fullspeed</a></div><div class="ttdeci">static void riscv_timer_set_fullspeed(bool fullspeed)</div><div class="ttdoc">Configure the RISC-V platform timer to run at full system clock speed.</div><div class="ttdef"><b>Definition:</b> riscv_platform_timer.h:49</div></div>
<div class="ttc" id="apico_8h_html"><div class="ttname"><a href="pico_8h.html">pico.h</a></div></div>
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